/Engine/Source/Editor/ContentBrowserData/Public/ContentBrowserItemData.h
Context for asynchronous item creation (for new items or duplicating existing ones). Data sources will return one of these (hosting a temporary item with any required context) when they want to begin the creation or duplication of an item item. UI involved in this creation flow should call ValidateItem for any name changes, as well as before calling FinalizeItem. Once finalized the temporary item should be replaced with the real one.
class FContentBrowserItemDataTemporaryContext